Mercurial > prosody-modules

annotate mod_muc_occupant_id/mod_muc_occupant_id.lua @ 3977:bbfcd786cc78

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mod_turncredentials: Add 'transport' attribute XEP-0215 recommends using 'transport' attribute and since coturn can work in both TCP and UPD modes this patch adds one <service> element for each combination of STUN/TURN and TCP/UDP.
author Wiktor Kwapisiewicz <wiktor@metacode.biz>
date Thu, 16 Apr 2020 17:34:53 +0200
parents cf682a02b6d8
children ae27f3359df8
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1
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2 -- Implementation of https://xmpp.org/extensions/inbox/occupant-id.html
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3 -- XEP-0421: Anonymous unique occupant identifiers for MUCs
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5 module:depends("muc");
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7 local uuid = require "util.uuid";
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8 local hmac_sha256 = require "util.hashes".hmac_sha256;
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9 local b64encode = require "util.encodings".base64.encode;
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11 local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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13 local function generate_id(occupant, room)
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14 local bare = occupant.bare_jid;
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16 if room._data.occupant_id_salt == nil then
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17 room._data.occupant_id_salt = uuid.generate();
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18 end
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20 if room._data.occupant_ids == nil then
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21 room._data.occupant_ids = {};
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22 end
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23
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24 if room._data.occupant_ids[bare] == nil then
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25 local unique_id = b64encode(hmac_sha256(bare, room._data.occupant_id_salt));
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26 room._data.occupant_ids[bare] = unique_id;
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27 end
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29 return room._data.occupant_ids[bare];
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30 end
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32 local function update_occupant(event)
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33 local stanza, room, occupant, dest_occupant = event.stanza, event.room, event.occupant, event.dest_occupant;
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35 -- "muc-occupant-pre-change" provides "dest_occupant" but not "occupant".
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36 if dest_occupant ~= nil then
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37 occupant = dest_occupant;
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38 end
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40 -- strip any existing <occupant-id/> tags to avoid forgery
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41 stanza:remove_children("occupant-id", xmlns_occupant_id);
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43 local unique_id = generate_id(occupant, room);
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44 stanza:tag("occupant-id", { xmlns = xmlns_occupant_id, id = unique_id }):up();
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45 end
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47 local function muc_private(event)
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48 local stanza, room = event.stanza, event.room;
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49 local occupant = room._occupants[stanza.attr.from];
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50
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51 update_occupant({
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52 stanza = stanza,
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53 room = room,
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54 occupant = occupant,
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55 });
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56 end
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57
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58 module:add_feature(xmlns_occupant_id);
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59 module:hook("muc-disco#info", function (event)
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60 event.reply:tag("feature", { var = xmlns_occupant_id }):up();
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61 end);
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63 module:hook("muc-broadcast-presence", update_occupant);
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64 module:hook("muc-occupant-pre-join", update_occupant);
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65 module:hook("muc-occupant-pre-change", update_occupant);
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66 module:hook("muc-occupant-groupchat", update_occupant);
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67 module:hook("muc-private-message", muc_private);